Thomas



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i N mk MM f `THOMAS s. SMITH; or'oINeININJ-irr, OHIO.

` Letters Patent No. 104,507, flared .fune 2l, 1870.

rmpnovnn Marston or' MAKING FILES. v

. The Schedule referred to in these Letters Patent and making part of the same .1', THOMAS Snn'rmof Gincinnati,in the county of Hamiltonand St. te of'` Ohio, haveinvented a. certain ImprovedMethod of making Files from PlanedSheet Metal, of which :the following yis a specification.

To make the liles, I take a.` sheet of iron, steel, or

other suitable metal, havingathiekness adequate lto the use forwhieliit is made, and, by means ot'a planing-machine, groove one or both surfaces-of the sheet metal in such a manner that sharp paralleli ridges are formed over the `entire sheet of metal, which is then placed in theformer andthe files struckouti i `igure 1 is a plan of` a sheet of metal plancdupon its surfaces, and also an end view of the same.

of planed metal exhibited in tig. 1.

The angular ridges a, formed on. the planing-machine on` the obverse surface of the sheet of metal A, may be'large represent a coarse surface of .the file;- the reverse si. face b is planed in ner ridges.

` o The metal havingbeenplaned is then placed upon a former, and, by means of dies of 4suitable form, the

les are struck from the `."heels`ii1tlie most economical manner. l

Figure 2 is aplan of the reverse surface of 'the sheet When the files are to be used in metal-working, .the sheet-steel is worked into files from the soit metal, :md the requisitetemper given them when finished.

This manner ot' formingiiles is milch the cheapest,

Vas far as thelabor involved is concerned; the grooves are cnt by-means of planer-'jacks or circular cutters,

`and are made atright angles to each other on oppo site sides ot the same plate, as illustrated in the dmiving, whichmethod of grooving permits the nseof a lighter metal. l

The les m. y be struck out of' the sheetbefore being planed, inwhich ease they are more readily fin.- v

ished, and present a better appealanee. i

'I claim as my invention- The manner of making files from planed sheetmetal, substantiallyin the `manner and forthe pnr pose specified.

, THOMAS S. SMITH.

Witnesscsi I C. L. FISHER, Crus-G. E. SMITH. 

